One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,14,15)(11,18,13,16)(12,20,22,17)(19,23,21,24)(25,26)(27,35)(28,32)(29,33)(30,34)(31,38)(36,40)(37,39)(1,2)(3,6)(4,5)(7,8)(10,15)(16,18)(17,20)(23,24)(25,26,30,34)(27,31,38,35)(28,32,29,33)(36,39,37,40)(2,5)(6,8)(9,11,14,13)(10,16,15,18)(12,21,22,19)(17,24,20,23)(25,26)(27,31)(28,32)(29,33)(30,34)(35,38)(36,39)(37,40)(3,7)(6,8)(9,10)(11,16)(12,17)(13,18)(14,15)(19,23)(20,22)(21,24)(25,27)(26,31)(28,36)(29,37)(30,38)(32,39)(33,40)(34,35) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,12,14,22)(10,17,15,20)(11,19,13,21)(16,23,18,24)(25,28,30,29)(26,32,34,33)(27,36,38,37)(31,39,35,40)(1,3)(2,6)(4,7)(5,8)(9,13,14,11)(10,16,15,18)(12,21,22,19)(17,23,20,24)(25,29,30,28)(26,33,34,32)(27,37,38,36)(31,40,35,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.